other private tests suggested few additions. As two of these tests have been proposed by several correspondents, it may be well to describe them. The one is the election of individuals, on account of their scientific eminence, to a certain well-known literary and scientific club, the name of which it is unnecessary to mention. The committee of this club have the power of electing annually, out of their regular turn, nine persons eminent for science, literature, art, or public services. The two or three men who have in each year received this coveted privilege on the ground of science now amount to a considerable number, and they are all on my list. Again, there are certain dining clubs in connection with the Royal Society, the one meeting on the afternoon of every evening that it meets, and the other more rarely, and there are about fifty members to each of these clubs, the same persons being in many instances members of both. The election to either of the clubs is a testimony of some value to the estimation of the scientific status of a man by his contemporaries ; almost all their members